Bd Tactical Folding Premium+ Backup Iron Sight Set A2 BUIS BD Sight Package includes a Flip-Up Rear Sight - Back-Up Iron Sight BACKED BY BD TACTICAL'S LIFETIME WARRANTY. If you ever have an issue with your irons we will replace them no questions asked! Front Sight A2 post elevation adjustment, Rear Sight Dual Aperture Windage Adjustment Our iron sights are designed to be used with either a regular or free float handguard & Flattop rails and both will fit all 7/8" Picatinny/Weaver style rails QD Automatic Flip Up Deploy Button Release At The Push Of A Finger And Locks In, Easy Quick And Secure Installation -Allen Screw Locking Clamp Rail Base Retention For Maintaning Zero Under Heavy Conditions Place When Deployed Or Folded,